MonoRail/Castle.MonoRail.Framework/Helpers/DateFormatHelper.cs

   1 // Copyright 2004-2008 Castle Project - http://www.castleproject.org/
   2 //
   3 // Licensed under the Apache License, Version 2.0 (the "License");
   4 // you may not use this file except in compliance with the License.
   5 // You may obtain a copy of the License at
   6 //
   7 //     http://www.apache.org/licenses/LICENSE-2.0
   8 //
   9 // Unless required by applicable law or agreed to in writing, software
  10 // distributed under the License is distributed on an "AS IS" BASIS,
  11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 // See the License for the specific language governing permissions and
  13 // limitations under the License.
  14
  15 namespace Castle.MonoRail.Framework.Helpers
  16 {
  17         using System;
  18
  19         /// <summary>
  20         /// Simple helper for date formatting
  21         /// </summary>
  22         public class DateFormatHelper : AbstractHelper
  23         {
  24                 #region Constructors
  25                 /// <summary>
  26                 /// Initializes a new instance of the <see cref="DateFormatHelper"/> class.
  27                 /// </summary>
  28                 public DateFormatHelper() { }
  29                 /// <summary>
  30                 /// Initializes a new instance of the <see cref="DateFormatHelper"/> class.
  31                 /// setting the Controller, Context and ControllerContext.
  32                 /// </summary>
  33                 /// <param name="engineContext">The engine context.</param>
  34                 public DateFormatHelper(IEngineContext engineContext) : base(engineContext) { }
  35                 #endregion
  36
  37                 /// <summary>
  38                 /// Alternative representation of a difference
  39                 /// between the specified date and now. If within 24hr
  40                 /// it returns <c>Today</c>. If within 48hr it returns
  41                 /// <c>Yesterday</c>. If within 40 days it returns
  42                 /// <c>x days ago</c> and otherwise it returns
  43                 /// <c>x months ago</c>
  44                 /// <para>
  45                 /// TODO: Think about i18n
  46                 /// </para>
  47                 /// </summary>
  48                 /// <param name="date">The date in the past (should be equal or less than now)</param>
  49                 /// <returns></returns>
  50                 public String AlternativeFriendlyFormatFromNow(DateTime date)
  51                 {
  52                         TimeSpan now = new TimeSpan(DateTime.Now.Ticks);
  53                         TimeSpan cur = new TimeSpan(date.Ticks);
  54
  55                         TimeSpan diff = now.Subtract(cur);
  56
  57                         if (diff.TotalHours <= 24)
  58                         {
  59                                 return "Today";
  60                         }
  61                         else if (diff.TotalHours <= 48)
  62                         {
  63                                 return "Yesterday";
  64                         }
  65                         else if (diff.TotalDays <= 40)
  66                         {
  67                                 return String.Format("{0} days ago", diff.Days);
  68                         }
  69                         else
  70                         {
  71                                 return String.Format("{0} months ago", (diff.Days / 30));
  72                         }
  73                 }
  74
  75                 /// <summary>
  76                 /// Returns the difference from the
  77                 /// specified <c>date</c> the the current date
  78                 /// in a friendly string like "1 day ago"
  79                 /// <para>
  80                 /// TODO: Think about i18n
  81                 /// </para>
  82                 /// </summary>
  83                 /// <param name="date">The date in the past (should be equal or less than now)</param>
  84                 /// <returns></returns>
  85                 public String FriendlyFormatFromNow(DateTime date)
  86                 {
  87                         TimeSpan now = new TimeSpan(DateTime.Now.Ticks);
  88                         TimeSpan cur = new TimeSpan(date.Ticks);
  89
  90                         TimeSpan diff = now.Subtract(cur);
  91
  92                         if (diff.TotalSeconds == 0)
  93                         {
  94                                 return "Just now";
  95                         }
  96
  97                         if (diff.Days == 0)
  98                         {
  99                                 if (diff.Hours == 0)
 100                                 {
 101                                         if (diff.Minutes == 0)
 102                                         {
 103                                                 return String.Format("{0} second{1} ago",
 104                                                         diff.Seconds, diff.Seconds > 1 ? "s" : String.Empty);
 105                                         }
 106                                         else
 107                                         {
 108                                                 return String.Format("{0} minute{1} ago",
 109                                                         diff.Minutes, diff.Minutes > 1 ? "s" : String.Empty);
 110                                         }
 111                                 }
 112                                 else
 113                                 {
 114                                         return String.Format("{0} hour{1} ago",
 115                                                 diff.Hours, diff.Hours > 1 ? "s" : String.Empty);
 116                                 }
 117                         }
 118                         else
 119                         {
 120                                 return String.Format("{0} day{1} ago",
 121                                         diff.Days, diff.Days > 1 ? "s" : String.Empty);
 122                         }
 123                 }
 124
 125                 /// <summary>
 126                 /// Formats to short date
 127                 /// </summary>
 128                 /// <param name="date"></param>
 129                 /// <returns>Short date, or <c>String.Empty</c> if <paramref name="date"/> is <c>null</c>.</returns>
 130                 public String ToShortDate(DateTime? date)
 131                 {
 132                         return date.HasValue ? date.Value.ToShortDateString() : string.Empty;
 133                 }
 134
 135                 /// <summary>
 136                 /// Formats to short date
 137                 /// </summary>
 138                 /// <param name="date"></param>
 139                 /// <returns>Short date and time, or <c>String.Empty</c> if <paramref name="date"/> is <c>null</c>.</returns>
 140                 public String ToShortDateTime(DateTime? date)
 141                 {
 142                         return date.HasValue ? date.Value.ToShortDateString() + " " + date.Value.ToShortTimeString() : string.Empty;
 143                 }
 144         }
 145 }